基于数模乘法器的电感电容测量方法

Method of Inductance and Capacitance Measurement Based on Multiplying D/A Converter

针对测量电感和电容仪器结构复杂,准确度不高的情况,提出了一种高准确度的电感与电容参数的测量方法。测量系统采用数字存储波形发生器技术、模拟-数字乘法器技术将电感与电容值的测量转化为直流电压测量。通过理论推导得到了测量电感与电容值的理论表达式,分析了测量方法误差及影响测量准确度的因素。Matlab仿真结果表明该方法的相对误差基本恒定,测量准确,为准确测量电感与电容值提供了科学依据。

In allusion to the complex structure of the current measuring instrument for inductance capacitance which is lack of accuracy, this paper proposes a measurement method of the high precison inductance and capacitance parameter tosolve the problem. The measurement of inductance and capacitance is translated into DC voltage measurement with the measuring method based on digital waveform storage technique and analog-digital hardware multiplication operater. Through theoretical derivation, academic expressions of inductance and capacitance are developed. The error of method and the factors influencing measurement accuracy are analyzed, The Matlab simulation results indicate that the relative error calculated by this algorithm is constant. The algorithm offers a reliable scientific method for the measurement of inductance and capacitance.